Merge branch 'master' into update-docker

Gopkg.lock

@@ -298,7 +298,7 @@
     "utils",
   ]
   pruneopts = "UT"
-  revision = "a2e2d27fd5eff22ba94b1f2bd2fc946f5bb7f041"
+  revision = "3e1e2dcfa54298e0fb86e0be86ab36d79f36473e"
 
 [[projects]]
   branch = "master"

Makefile

@@ -303,16 +303,20 @@ bundle-darwin: binary-darwin
 .PHONY: binary-linux binary-darwin bundle-linux bundle-darwin
 
 #################################################
-# Targets for creating OS specific artifacts
+# Targets for creating OS specific artifacts and archives
 #################################################
 
 artifacts-linux-tag: bundle-linux debian
 
 artifacts-darwin-tag: bundle-darwin
 
-artifacts-tag: artifacts-linux-tag artifacts-darwin-tag
+artifacts-archive-tag:
+	$Q mkdir -p $(RELEASE)
+	$Q git archive v$(VERSION) | gzip > $(RELEASE)/step-certificates_$(VERSION).tar.gz
 
-.PHONY: artifacts-linux-tag artifacts-darwin-tag artifacts-tag
+artifacts-tag: artifacts-linux-tag artifacts-darwin-tag artifacts-archive-tag
+
+.PHONY: artifacts-linux-tag artifacts-darwin-tag artifacts-archive-tag artifacts-tag
 
 #################################################
 # Targets for creating step artifacts
@@ -321,7 +325,7 @@ artifacts-tag: artifacts-linux-tag artifacts-darwin-tag
 # For all builds that are not tagged
 artifacts-master:
 
-# For all build with a release candidate tag
+# For all builds with a release-candidate (-rc) tag
 artifacts-release-candidate: artifacts-tag
 
 # For all builds with a release tag

README.md

@@ -42,7 +42,7 @@ mTLS](https://raw.githubusercontent.com/smallstep/certificates/master/images/con
 There's just one problem: **you need certificates issued by your own
 certificate authority (CA)**. Building and operating a CA, issuing
 certificates, and making sure they're renewed before they expire is tricky.
-This project provides the infratructure, automations, and workflows you'll
+This project provides the infrastructure, automations, and workflows you'll
 need.
 
 `step certificates` is part of smallstep's broader security architecture, which

autocert/INSTALL.md

@@ -174,3 +174,7 @@ $ kubectl get mutatingwebhookconfiguration
 NAME                      CREATED AT
 autocert-webhook-config   2019-01-17T22:57:57Z
 ```
+
+### Move on to usage instructions
+
+Make sure to follow the autocert usage steps at https://github.com/smallstep/certificates/tree/master/autocert#usage

autocert/controller/main.go

@@ -51,6 +51,18 @@ type Config struct {
 	Bootstrapper                    corev1.Container `yaml:"bootstrapper"`
 	Renewer                         corev1.Container `yaml:"renewer"`
 	CertsVolume                     corev1.Volume    `yaml:"certsVolume"`
+	RestrictCertificatesToNamespace bool             `yaml:"restrictCertificatesToNamespace"`
+	ClusterDomain                   string           `yaml:"clusterDomain"`
+}
+
+// GetClusterDomain returns the Kubernetes cluster domain, defaults to
+// "cluster.local" if not specified in the configuration.
+func (c Config) GetClusterDomain() string {
+	if c.ClusterDomain != "" {
+		return c.ClusterDomain
+	}
+
+	return "cluster.local"
 }
 
 // PatchOperation represents a RFC6902 JSONPatch Operation
@@ -216,6 +228,7 @@ func mkBootstrapper(config *Config, commonName string, namespace string, provisi
 		Name:  "COMMON_NAME",
 		Value: commonName,
 	})
+
 	b.Env = append(b.Env, corev1.EnvVar{
 		Name: "STEP_TOKEN",
 		ValueFrom: &corev1.EnvVarSource{
@@ -357,7 +370,8 @@ func addAnnotations(existing, new map[string]string) (ops []PatchOperation) {
 func patch(pod *corev1.Pod, namespace string, config *Config, provisioner Provisioner) ([]byte, error) {
 	var ops []PatchOperation
 
-	commonName := pod.ObjectMeta.GetAnnotations()[admissionWebhookAnnotationKey]
+	annotations := pod.ObjectMeta.GetAnnotations()
+	commonName := annotations[admissionWebhookAnnotationKey]
 	renewer := mkRenewer(config)
 	bootstrapper, err := mkBootstrapper(config, commonName, namespace, provisioner)
 	if err != nil {
@@ -376,7 +390,10 @@ func patch(pod *corev1.Pod, namespace string, config *Config, provisioner Provis
 // shouldMutate checks whether a pod is subject to mutation by this admission controller. A pod
 // is subject to mutation if it's annotated with the `admissionWebhookAnnotationKey` and if it
 // has not already been processed (indicated by `admissionWebhookStatusKey` set to `injected`).
-func shouldMutate(metadata *metav1.ObjectMeta) bool {
+// If the pod requests a certificate with a subject matching a namespace other than its own
+// and restrictToNamespace is true, then shouldMutate will return a validation error
+// that should be returned to the client.
+func shouldMutate(metadata *metav1.ObjectMeta, namespace string, clusterDomain string, restrictToNamespace bool) (bool, error) {
 	annotations := metadata.GetAnnotations()
 	if annotations == nil {
 		annotations = map[string]string{}
@@ -385,10 +402,26 @@ func shouldMutate(metadata *metav1.ObjectMeta) bool {
 	// Only mutate if the object is annotated appropriately (annotation key set) and we haven't
 	// mutated already (status key isn't set).
 	if annotations[admissionWebhookAnnotationKey] == "" || annotations[admissionWebhookStatusKey] == "injected" {
-		return false
+		return false, nil
 	}
 
-	return true
+	if !restrictToNamespace {
+		return true, nil
+	}
+
+	subject := strings.Trim(annotations[admissionWebhookAnnotationKey], ".")
+
+	err := fmt.Errorf("subject \"%s\" matches a namespace other than \"%s\" and is not permitted. This check can be disabled by setting restrictCertificatesToNamespace to false in the autocert-config ConfigMap", subject, namespace)
+
+	if strings.HasSuffix(subject, ".svc") && !strings.HasSuffix(subject, fmt.Sprintf(".%s.svc", namespace)) {
+		return false, err
+	}
+
+	if strings.HasSuffix(subject, fmt.Sprintf(".svc.%s", clusterDomain)) && !strings.HasSuffix(subject, fmt.Sprintf(".%s.svc.%s", namespace, clusterDomain)) {
+		return false, err
+	}
+
+	return true, nil
 }
 
 // mutate takes an `AdmissionReview`, determines whether it is subject to mutation, and returns
@@ -418,7 +451,20 @@ func mutate(review *v1beta1.AdmissionReview, config *Config, provisioner Provisi
 		"user":         request.UserInfo,
 	})
 
-	if !shouldMutate(&pod.ObjectMeta) {
+	mutationAllowed, validationErr := shouldMutate(&pod.ObjectMeta, request.Namespace, config.GetClusterDomain(), config.RestrictCertificatesToNamespace)
+
+	if validationErr != nil {
+		ctxLog.WithField("error", validationErr).Info("Validation error")
+		return &v1beta1.AdmissionResponse{
+			Allowed: false,
+			UID:     request.UID,
+			Result: &metav1.Status{
+				Message: validationErr.Error(),
+			},
+		}
+	}
+
+	if !mutationAllowed {
 		ctxLog.WithField("annotations", pod.Annotations).Info("Skipping mutation")
 		return &v1beta1.AdmissionResponse{
 			Allowed: true,

autocert/controller/main_test.go

@@ -0,0 +1,75 @@
+package main
+
+import (
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"testing"
+)
+
+func TestGetClusterDomain(t *testing.T) {
+	c := Config{}
+	if c.GetClusterDomain() != "cluster.local" {
+		t.Errorf("cluster domain should default to cluster.local, not: %s", c.GetClusterDomain())
+	}
+
+	c.ClusterDomain = "mydomain.com"
+	if c.GetClusterDomain() != "mydomain.com" {
+		t.Errorf("cluster domain should default to cluster.local, not: %s", c.GetClusterDomain())
+	}
+}
+
+func TestShouldMutate(t *testing.T) {
+	testCases := []struct {
+		description string
+		subject     string
+		namespace   string
+		expected    bool
+	}{
+		{"full cluster domain", "test.default.svc.cluster.local", "default", true},
+		{"full cluster domain wrong ns", "test.default.svc.cluster.local", "kube-system", false},
+		{"left dots get stripped", ".test.default.svc.cluster.local", "default", true},
+		{"left dots get stripped wrong ns", ".test.default.svc.cluster.local", "kube-system", false},
+		{"right dots get stripped", "test.default.svc.cluster.local.", "default", true},
+		{"right dots get stripped wrong ns", "test.default.svc.cluster.local.", "kube-system", false},
+		{"dots get stripped", ".test.default.svc.cluster.local.", "default", true},
+		{"dots get stripped wrong ns", ".test.default.svc.cluster.local.", "kube-system", false},
+		{"partial cluster domain", "test.default.svc.cluster", "default", true},
+		{"partial cluster domain wrong ns is still allowed because not valid hostname", "test.default.svc.cluster", "kube-system", true},
+		{"service domain", "test.default.svc", "default", true},
+		{"service domain wrong ns", "test.default.svc", "kube-system", false},
+		{"two part domain", "test.default", "default", true},
+		{"two part domain different ns", "test.default", "kube-system", true},
+		{"one hostname", "test", "default", true},
+		{"no subject specified", "", "default", false},
+		{"three part not cluster", "test.default.com", "kube-system", true},
+		{"four part not cluster", "test.default.svc.com", "kube-system", true},
+		{"five part not cluster", "test.default.svc.cluster.com", "kube-system", true},
+		{"six part not cluster", "test.default.svc.cluster.local.com", "kube-system", true},
+	}
+
+	for _, testCase := range testCases {
+		t.Run(testCase.description, func(t *testing.T) {
+			mutationAllowed, validationErr := shouldMutate(&metav1.ObjectMeta{
+				Annotations: map[string]string{
+					admissionWebhookAnnotationKey: testCase.subject,
+				},
+			}, testCase.namespace, "cluster.local", true)
+			if mutationAllowed != testCase.expected {
+				t.Errorf("shouldMutate did not return %t for %s", testCase.expected, testCase.description)
+			}
+			if testCase.subject != "" && mutationAllowed == false && validationErr == nil {
+				t.Errorf("shouldMutate should return validation error for invalid hostname")
+			}
+		})
+	}
+}
+
+func TestShouldMutateNotRestrictToNamespace(t *testing.T) {
+	mutationAllowed, _ := shouldMutate(&metav1.ObjectMeta{
+		Annotations: map[string]string{
+			admissionWebhookAnnotationKey: "test.default.svc.cluster.local",
+		},
+	}, "kube-system", "cluster.local", false)
+	if mutationAllowed == false {
+		t.Errorf("shouldMutate should return true even with a wrong namespace if restrictToNamespace is false.")
+	}
+}

autocert/install/02-autocert.yaml

@@ -21,6 +21,8 @@ metadata:
 data:
   config.yaml: |
     logFormat: json # or text
+    restrictCertificatesToNamespace: true
+    clusterDomain: cluster.local
     caUrl: https://ca.step.svc.cluster.local
     certLifetime: 24h
     renewer:

docs/GETTING_STARTED.md

@@ -421,7 +421,7 @@ Please enter a password to encrypt the provisioner private key? password
 },
 [...]
 
-# launch CA...
+## launch CA...
 $ step-ca $(step path)/config/ca.json
 Please enter the password to decrypt ~/.step/secrets/intermediate_ca_key: password
 2019/02/21 12:09:51 Serving HTTPS on :9443 ...
@@ -456,6 +456,79 @@ $ step ca renew site.crt site.key
 error renewing certificate: Unauthorized
 ```
 
+## Use Oauth OIDC to obtain personal certificates
+
+To authenticate users with the CA you can leverage services that expose OAuth
+OpenID Connect identity providers. One of the most common providers, and the
+one we'll use in this example, is G-Suite.
+
+Navigate to the Google APIs developer console and pick a suitable project from the
+top navbar's dropdown.
+
+![Google Dev Console](oidc1.png)
+
+In the masthead navigation click **Credentials** (key symbol) and then "OAuth
+consent screen" from the subnav. Fill out naming details, all mandatory fields,
+and decide if your app is of type **Public** or **Internal**. Internal
+will make sure the access scope is bound to your G-Suite organization.
+**Public** will let anybody with a Google Account log in, incl.
+`gmail.com` accounts.
+
+Move back to **Credentials** on the subnav and choose "OAuth client ID" from the
+**Create credentials** dropdown. Since OIDC will be used from the `step CLI` pick **Other**
+from the available options and pick a name (e.g. **Step CLI**).
+
+![Create credential](oidc2.png)
+
+On successful completion, a confirmation modal with both `clientID` and
+`clientSecret` will be presented. Please note that the `clientSecret` will
+allow applications access to the configured OAuth consent screen. However, it
+will not allow direct authentication of users without their own MfA credentials
+per account.
+
+![OIDC credentials](oidc3.png)
+
+Now using `clientID` and `clientSecret` run the following command to add
+G-Suite as a provisioner to `step certificates`. Please see [`step ca
+provisioner add`](https://smallstep.com/docs/cli/ca/provisioner/add/)'s docs
+for all available configuration options and descriptions.
+
+```bash
+$ step ca provisioner add Google --type oidc --ca-config $(step path)/config/ca.json \
+  --client-id 972437157139-ssiqna0g4ibuhafl3pkrrcb52tbroekt.apps.googleusercontent.com \
+  --client-secret RjEk-GwKBvdsFAICiJhn_RiF \
+  --configuration-endpoint https://accounts.google.com/.well-known/openid-configuration \
+  --domain yourdomain.com --domain gmail.com
+```
+
+Start up the online CA or send a HUP signal if it's already running to reload
+the configuration and pick up the new provisioner. Now users should be able to
+obtain certificates using the familiar `step ca certificate` flow:
+
+```bash
+$ step ca certificate sebastian@smallstep.com personal.crt personal.key
+Use the arrow keys to navigate: ↓ ↑ → ←
+What provisioner key do you want to use?
+    fYDoiQdYueq_LAXx2kqA4N_Yjf_eybe-wari7Js5iXI (admin)
+  ▸ 972437157139-ssiqna0g4ibuhafl3pkrrcb52tbroekt.apps.googleusercontent.com (Google)
+✔ Key ID: 972437157139-ssiqna0g4ibuhafl3pkrrcb52tbroekt.apps.googleusercontent.com (Google)
+✔ CA: https://localhost
+✔ Certificate: personal.crt
+✔ Private Key: personal.key
+
+$ step certificate inspect --short personal.crt                                                                 ⏎
+X.509v3 TLS Certificate (ECDSA P-256) [Serial: 6169...4235]
+  Subject:     106202051347258973689
+               sebastian@smallstep.com
+  Issuer:      Local CA Intermediate CA
+  Provisioner: Google [ID: 9724....com]
+  Valid from:  2019-03-26T20:36:28Z
+          to:  2019-03-27T20:36:28Z
+```
+
+Now it's easy for anybody in the G-Suite organization to obtain valid personal
+certificates!
+
 ## Notes on Securing the Step CA and your PKI.
 
 In this section we recommend a few best practices when it comes to

docs/distribution.md

@@ -88,9 +88,10 @@ e.g. `v1.0.2`
 
     Travis will build and upload the following artifacts:
 
-    * **step-ca_1.0.3_amd64.deb**: debian package for installation on linux.
+    * **step-certificates_1.0.3_amd64.deb**: debian package for installation on linux.
-    * **step-ca_1.0.3_linux_amd64.tar.gz**: tarball containing a statically compiled linux binary.
+    * **step-certificates_1.0.3_linux_amd64.tar.gz**: tarball containing a statically compiled linux binary.
-    * **step-ca_1.0.3_darwin_amd64.tar.gz**: tarball containing a statically compiled darwin binary.
+    * **step-certificates_1.0.3_darwin_amd64.tar.gz**: tarball containing a statically compiled darwin binary.
+    * **step-certificates.tar.gz**: tarball containing a git archive of the full repo.
 
 *All Done!*